EZ-DE Swimming Pool Diatomaceous Earth DE Filter Media Powder (36 sqft) Make sure to select the right size EZ-DE bag that matches your filter. 3 sizes are available, 36sqft, 48sqft, and 60sqft. 72sqft filters use 2xEZ-DE36 bags. If your filter is not one of these standard sizes then simply select the EZ-DE bag closest in size to your filter size. Solves all the headaches associated with adding DE to your pool after a backwash or filter cleaning Keeps DE powder off your face, skin, clothes and puts it directly into the skimmer where it belongs Precisely measured amount of DE to recharge your filter after a backwash or cleaning. Use 1 full bag after each backwash or cleaning. 1 bag = 1 backwash. There is no need to measure or scoop DE out of a big bag or box which you have to store until the next time you need it. You only buy what you need and no more. The proper dose of DE helps your filter work better and run longer between backwashes and cleanings